Jun‐ichi Suzuki

Comprehensive Research Organization for Science and Society

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Takayuki Oku

Japan Atomic Energy Agency

Shigehisa Arai

Tokyo Institute of Technology

Nobuhiko Nishiyama

Tokyo Institute of Technology

Tomohiro Amemiya

Tokyo Institute of Technology

T. Shinohara

Japan Atomic Energy Agency

Hirohiko M. Shimizu

High Energy Accelerator Research Organization

Kazuki Ohishi

Comprehensive Research Organization for Science and Society

S. Takata

Japan Proton Accelerator Research Complex

Yusuke Hayashi

Toshiba (Japan)

Takashi Ino

High Energy Accelerator Research Organization

Cooperative Institutions

High Energy Accelerator Research Organization

308

The University of Tokyo

284

Centre National de la Recherche Scientifique

259

Japan Atomic Energy Agency

179

Japan Proton Accelerator Research Complex

150

Kyoto University

137

Japan Aerospace Exploration Agency

128

Tohoku University

114

University of California, San Diego

109

University of California, Berkeley

104

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Application of neutron shield concrete to neutron scattering instrument TAIKAN in J-PARC

Progress in Nuclear Science and Technology (2014)

Koichi Okuno Masayoshi Kawai Hitoshi Yamada T. Shinohara S. Takata

The main neutron shield for the neutron beam line and neutron spectrometer at J-PARC consists of multilayers of iron and ordinary concrete or boric acid resin and ordinary concrete.However, the available space inside the shield will become limited since a multilayer shield must have sufficient thickness to guarantee radiation safety outside of the shield.Recently, a neutron shield concrete was developed and applied to the shield for the TAIKAN neutron scattering instrument at J-PARC.Neutron transport calculations revealed that the shield's thickness could be reduced to about 70% of that of the original design, which used ordinary concrete.The resulting slim neutron shield structure could leave more space in the interior shielded areas.

J-PARC

Neutron Transport

10.15669/pnst.4.619

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Citations (8)

Evidence of quantum size effect in nanocrystalline silicon by optical absorption

Physical review. B, Condensed matter (2001)

Takahiro Matsumoto Jun‐ichi Suzuki Masato Ohnuma Yoshihiko Kanemitsu Yasuaki Masumoto

The optical absorption spectrum in nanocrystalline silicon $(n\ensuremath{-}\mathrm{Si})$ was determined from both light transmittance and reflectance measurements. We observed that $n\ensuremath{-}\mathrm{Si}$ has a phonon structure in the optical absorption spectrum. This structure originates from momentum-conserving TO phonon absorption and emission, and provides direct evidence that $n\ensuremath{-}\mathrm{Si}$ is an indirect-band-gap semiconductor with quantum size effects. By using small-angle x-ray scattering to measure the nanocrystal size distribution, we found that the band-gap widening varies as ${(1/L)}^{1.6}$ with decreasing nanocrystal diameter L.

Nanocrystalline material

Nanocrystalline silicon

10.1103/physrevb.63.195322

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Citations (68)

A consideration on InP-semiconductor-based 2-dimensional photonic crystal

IEICE technical report. Electron devices (1994)

Toshihiko Baba T. Matsuzaki Jun‐ichi Suzuki Daisuke Sugawara

Source

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Size-tunable Confined Water in a Room Temperature Ionic Liquid

Proceedings of the 2nd International Symposium on Science at J-PARC — Unlocking the Mysteries of Life, Matter and the Universe — (2015)

Hiroshi Abe Takahiro Takekiyo Machiko Shigemi Yukihiro Yoshimura Shu Tsuge

The existence of confined water (water pocket) in room temperature ionic liquid (RTIL) was demonstrated by the complementary use of small angle X-ray scattering (SAXS) and small angle neutron scattering (SANS).The RTIL was 1-butyl-3-methylimidazolium nitrate, [C 4 mim][NO 3 ].Below 90 mol % D 2 O, a distinct peak appeared in SANS, although no peak was observed in SAXS.At 24.8 °C, the water pocket became larger in proportion to the water concentration.The size and distribution of the water pocket, which depend both on water concentration and temperature, were simulated by ab initio modeling based on the SANS data.

Liquid water

10.7566/jpscp.8.033001

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Citations (9)

Room-temperature Continuous-wave Operation of GaInAsP/SOI Hybrid Laser Fabricated by N2 Plasma Activated Bonding

Yuusuke Hayashi 林. 侑介 Jun‐ichi Suzuki 鈴木純一 Satoshi Inoue

Continuous wave

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Monitoring of Bainite Transformation Using in Situ Neutron Scattering

Metals (2016)

Hikari Nishijima Yo Tomota Yuhua Su Wu Gong Jun‐ichi Suzuki

Bainite transformation behavior was monitored using simultaneous measurements of dilatometry and small angle neutron scattering (SANS). The volume fraction of bainitic ferrite was estimated from the SANS intensity, showing good agreement with the results of the dilatometry measurements. We propose a more advanced monitoring technique combining dilatometry, SANS and neutron diffraction.

Volume fraction

Neutron Imaging

10.3390/met6010016

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Citations (10)

Fabrication of diamond films under high density helium plasma formed by electron cyclotron resonance

Elsevier eBooks (1991)

Motokazu Yuasa Hiroshi Kawarada Jin Wei Jing Sheng Jun‐ichi Suzuki

Electron cyclotron resonance

Cyclotron resonance

Ion cyclotron resonance

10.1016/b978-0-444-89455-7.50072-1

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A Neutron Depolarization Measurement of Single Crystal Fe by Using a ³He Neutron Spin Filter and Magnetic Super-mirrors

Proceedings of the 3rd J-PARC Symposium (J-PARC2019) (2021)

Takuya Okudaira Takayuki Oku K. Sakai Kosuke Hiroi T. Shinohara

Crystal (programming language)

10.7566/jpscp.33.011096

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Performance of the Belle II Silicon Vertex Detector

Proceedings of The European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2021) (2020)

A. Paladino H. Aihara T. Aziz S. Bacher S. Bahinipati

The Belle II experiment at the SuperKEKB collider of KEK (Japan) will accumulate 50 ab$^{-1}$ of e$^+$e$^-$ collision data at an unprecedented instantaneous luminosity of 8 $\times 10^{35}$ cm$^{-2}$s$^{-1}$, about 40 times larger than its predecessor. The Belle II vertex detector plays a crucial role in the rich Belle II physics program, especially for time-dependent measurements. It consists of two layers of DEPFET-based pixels and four layers of double sided silicon strips detectors(SVD). The vertex detector has been recently completed and installed in Belle II for the physics run started in spring 2019. We report here results on the commissioning of the SVD and its performance measured with the first collision data set.

STRIPS

10.22323/1.364.0148

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LiteBIRD satellite: JAXA's new strategic L-class mission for all-sky surveys of cosmic microwave background polarization

Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave (2020)

M. Hazumi P. A. R. Ade Alexandre Adler Erwan Allys Kam Arnold

LiteBIRD, the Lite (Light) satellite for the study of B-mode polarization and Inflation from cosmic background Radiation Detection, is a space mission for primordial cosmology and fundamental physics. JAXA selected LiteBIRD in May 2019 as a strategic large-class (L-class) mission, with its expected launch in the late 2020s using JAXA's H3 rocket. LiteBIRD plans to map the cosmic microwave background (CMB) polarization over the full sky with unprecedented precision. Its main scientific objective is to carry out a definitive search for the signal from cosmic inflation, either making a discovery or ruling out well-motivated inflationary models. The measurements of LiteBIRD will also provide us with an insight into the quantum nature of gravity and other new physics beyond the standard models of particle physics and cosmology. To this end, LiteBIRD will perform full-sky surveys for three years at the Sun-Earth Lagrangian point L2 for 15 frequency bands between 34 and 448 GHz with three telescopes, to achieve a total sensitivity of 2.16 μK-arcmin with a typical angular resolution of 0.5° at 100 GHz. We provide an overview of the LiteBIRD project, including scientific objectives, mission requirements, top-level system requirements, operation concept, and expected scientific outcomes.

Cosmic background radiation

Observational cosmology

Lagrangian point

10.1117/12.2563050

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Citations (34)